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Lung surgical specimens. (a) Surgical specimens stained with hematoxylin and eosin (H&E). (b) Immunohistochemical staining for P40 was negative. (c) Immunohistochemical staining for thyroid transcription factor 1 (TTF 1) was negative. (d) A 22C3 IHC pharmDx assay detected PD‐L1 expression on about 100% of tumor cells
